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I don't think the figures quite fit. You mention a savings rate of €1,200 in your profile, but say that it's currently €20k / year (€1,666 / month).
What about the dividends? Are they reinvested? If not, these are withdrawals from the custody account.

Otherwise: you did everything right to invest so heavily at such an early stage. I only started at 28 and had to work really hard to have a satisfactory portfolio (for me) for my age.

If I were you, I would think about where exactly you want to go. "Building up assets" is not very specific. You're probably not saving for the sake of saving.
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@KevinC You're right, I'm currently saving around €1000 via a savings plan. On top of that, I reinvest around €200 per month in dividends. I get to the 20k because I save a large proportion of my bonus and Christmas bonus etc.. That's usually between 5-10k a year.

Where do I want to go?
I want to have the freedom to decide for myself how much and where I want to work from around the age of 55. So it doesn't have to be early retirement, but I don't want to be dependent on a salary either. I find it difficult to give a fixed figure, as I don't know how some factors such as inflation will affect me, but 1.5 million would be the target by 55 (as things stand now).
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@MoKi28 You could use this - as a very rough guide - to calculate your required savings rate. Personally, I always calculate conservatively with a 5% return after inflation in the long term.
Let's quickly unpack the calculator: €1,500 savings rate (better safe than sorry), 27-year investment horizon, 5% return = €1.524 million. Goes exactly to 🤷‍♂️
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@KevinC Buffer: Salary increases > inflation rate not taken into account, return may be higher.
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@KevinC yes, that's exactly the 5% I was expecting ;)
Exactly, I expect a decent salary increase in the near future, which of course comes on top.